xStack® DGS-3420 Series Layer 2+ Managed Stackable Gigabit Switch Hardware Installation Reference Guide
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PoE Specifications
• Supports IEEE 802.3af PoE and IEEE 802.3at PoE+ compliance.
• Supplies power to PD devices up to 15.4W per port (802.3af) or 30W+ per port
(802.3at) more sufficiently.
• Power Budget: 370W.
• Supports the Auto Discovery feature. It’ll automatically recognize a connection to
PD devices and immediately provide power.
• Supports the Auto Disable Port feature. If the port’s electrical current is over 600mA
this feature will activate and still keep the other ports active.
• Supports the Active Circuit Protection feature. It’ll automatically disable a port if
there is an electrical short and still keep the other ports active.
Power Classification Table:
Class Usage Max power used by PD
0 Default 12.95W
1 Optional 3.84W
2 Optional 6.49W
3 Optional 12.95W
4 Reserved 12.95W
• For 802.3at capable devices, provide power allocation of 0.1 watt granularity using
LLDP method.
Class Usage Minimum power levels of output of PSE
0 Default 15.4W
1 Optional 4.0W
2 Optional 7.0W
3 Optional 15.4W
4 Reserved 31W
Class Usage Max power received by PD
0 Default 13.0W
1 Optional 3.84W
2 Optional 6.49W
3 Optional 13.0W
4 Reserved 25.5W
• Follow the PSE pin out standard of Alternative A, sending out power over pins 1, 2,
3, 6 and 8 of CAT3~6A UTP cables for 802.3af devices; or CAT5e~6A UTP cables
for 802.3at devices.
• DGS-3420-28PC, DGS-3420-52P works with all D-Link 802.3af and 802.3at
capable devices It also works with all non-802.3af and non-802.3at capable D-Link
Access Points, IP Cameras and IP phones using the DWL-P50 PoE adapter.
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